FIELD DOCUMENTS - Laserfiche WebLink

Home Browse Search

Quarterly Report - Third Quarter 2011 IDEALEASE - STOCKTON 1137 South Stockton Street, Stockton, California 1.0. INTRODUCTION At the request of Idealease of Stockton, Advanced GeoEnvironmental, Inc. (AGE) has prepared this quarterly report for 1137 South Stockton Street, Stockton, California (the site). The scope of work included the performance of a quarterly ground water monitoring event, submission of monitoring and analytical data to the Water Resources Control Board's GeoTracker information management system and preparation of this report. The site and the surrounding area are illustrated in Figure 1. Structure, boring and well locations are illustrated in Figure 2. Background information is included in Appendix A. 2.0. PROCEDURES On 16 September 2011, a quarterly ground water monitoring event was conducted at the site. Depth to ground water measurements were collected from monitoring wells MW-1 through MW-4. Wells MW-1, MW-2 and MW-4 were sampled in accordance with AGE's standard monitoring and sampling procedures, described in Appendix B. Field data and logs are provided in Appendix C. Ground water monitoring well construction details are summarized in Table 1. 3.0. FINDINGS The ground water elevation, flow direction, and gradient were determined from field data collected on 16 September 2011 ; the contaminant impact to ground water was quantified by the laboratory analytical data. • At the time of the September 2011 monitoring event, depths to ground water ranged from 13.28 feet (MW-1) to 14.90 feet (MW-3) below the tops of the well casings (btoc). Ground water elevation at the site ranged from 5.11 feet(MW-1)to 5.35 feet (MW-4) below North American Vertical Datum (NAVD88) and averaged approximately 5.19 feet below NAVD88. Depth to ground water and ground water elevation data is included in Table 2. • Ground water flow direction was determined from the ground water elevation data from wells MW-1 through MW-4. The ground water was inferred to be flowing radially towards a ground water depression centered at well MW-4, at hydraulic gradients of 0.003 feet per foot (ft/ft), and 0.004 ft/ft. Figure 2 illustrates the contoured ground water elevations as measured on 16 September 2011 . • Total petroleum hydrocarbons quantified as diesel (TPH-d) were reported in wells MW-2 and MW-4 at concentrations of 290 micrograms per liter(Ng/1) and 260 pg/l, respectively. Advanced GeoEnvironmental,Inc.